But AMD's Opteron 2400 and 8400 processor series represents the best of what AMD can do on every front: the most modern manufacturing process, a new cache structure that reduces many bottlenecks, and the Istanbul architecture was built from the ground up to get the most out of six cores. And where Intel's Nehalem chips require customers to buy entirely new servers (or at least motherboards), the Istanbul is a drop-in replacement for older Shanghai and Barcelona chips.

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